Tier Component Installations

I work at a small to medium business with limited resources for buying servers. Our current server setup is a 2-tier installation with the content store on one server and the application + gateway on the other. When we started creating our data warehouse, we used the same server that contains the Cognos content store because of the license limitations with our database.
Now that our data warehouse has grown large enough that it needs its own server resources, I am going to move the Cognos content store to a different server. The question is, should I request a new server just for the content store to maintain the 2-tier architecture or would consolidating all the Cognos components onto one server be a good idea? I know the user guide says having them separate can improve performance. Does anyone have any experience with all-in-one Cognos component installations?
Thanks in advance for your time.
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